Steam-actuated valve



illlniTnn STATES llaTnnT @Trina JOHN C. BROMIJEY, OF ROCK ISLAND,`ILLII\'OIS.

EAIVl'-ACTUAT`ED VALVE.

SPECIFICATION forming part of Letters Patent No. 398,491, dated February 26, 18539.

Application filed May 4, 1888.

To all whom it may concern.:

Be it known that I, JOHN C. BROMLEY, of Rock Island, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Steam-Actuated Valvesi and I do hereby'declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form part of this specification, in which- Figure l is a verticallongitudinal section through a steamcylinder and valve-chest, illustrating my invention. Fig. 2 is a detail top plan view of the steam-cylinder, the valvechestbeing removed. Fig. 3 is a cross-sectional view of line o; ir, Fig. l.

This invention is an iunorovement in steamengines, its object being to provide an autol matie steam-actuated valve for controlling the ingress and egress ot steam to and from the cylinder and it consists in the novel construction ot' the valve and piston-head,rand in the arrangement of the port passages, as hereinafter described, illustrziltedin the draw ings, and clearly specified in the claims hereto appended.

Referring to the drawings by letter, A represents the cylinder, the upper surface, u., ot' which is dressed to form a seat for and steanr tight joint with 'the base ot a cylindrical valve-chest, lil.

C is a steanringress port t'ormed centrally in part d ot' eylini'ler A and opening into chest B at ri', as shown.

D F. are the main steamporls exiemliiig through part o. oi the c vlinder to the opposite ends thereof and opening into chest B at d e on opposite sides of openings c, as shown.

F is a small port-channel communicating with the interior ot cylinder A neai` the port E. The main part of' the channel is formed by grooving the part a, as shown, the groove being closed by the base oi' the valve-chest when the latter is bolted in place. Channel F extends to and communicates with the valve-chest at the end approximating port D.

G is a port-channel corresponding to channel F, but extending t'rom the end ot.' cylinder A approximating port D to the end of the valve-chest apmoxim'ating port E.

Serial No. 272,904. (No model.)

H designates the piston-head, tol-ined o'l the plates h h and Ainterposed packing. I I are annular grooves in the peripheriesoit' plates h h, which communicate with the interior of the cylinder by peitoiations 1i i, as shown. The thickness of the head II is such that when at opposite extremes ot its movement in cylinder A the groove I nearest the center ol' the cylinder is in communication with one ot' the channels, F or G.

.I designates the valve, preferably cylindrical, and having a central reduced portion, j, at opposite ends of which are two collars, K lc, which have annular packed grooves, as shown.

L Z are heads on the ends of the valve, which is reduced between said heads and the collars, as shown at P p. These heads are properly packed to prevent leakage of steam, and have annular grooves M in., respectively, a-nd a scries of perforations, N n, respectively, extending through the tace of the valve and communicating with the grooves, as shown.

O o are exhaust-ports leading' from chest B, near the opposite ends thereof. Grooves M in are adapted to communicate with portchannels F G and ports O o, respectively, when the valve is in proper position, as hereinafter explained. The ports C O 0 are connected with any proper delivery and exhaust pipes. p

The operation. of the engine is as follows: Valve J being in the position shown in the drawings, so that port C communicates With port- E through the annular channel between the collars I( 7a, and port D communicates with port o through the annular chamber in the chest between collars 7c. and head Z of the valve, steam entering port C passes through port E to the cylinder, 'forcing piston-head H to the opposite end of the cylinder, as shown, and as head II arrives at this position its groove I communicates with channel G, the steam under pressure in. the cylinder enters groove I by openings il, and from said groove passes into channel G, passing through the latter to groove M in valve-head L, and, escaping from groove M by openings N, impinges against the head of valve-seat B and forces the valve back until its head Z strikes the opposite side of the chest. This movethe chest. Y

lishes communication between the grooves m ment of thc valve shifts collars K k, causing them to establish communication between ports C and D and ports E and 0, so that the ingress and egress passages of the steam are antomatically and instantaneously transposed. The head H is then forced to the opposite end of the cylinder, and the steam passes into channel F, to groove m, into the valve-chest, driving the valve back to its former position. lVhen the valve is in the position shown, the groove m communicates with port o, as does also the port D, owing to the width of the opening of port 0,' but this communica-tion of grooves m or M with ports o or O (according to the position of the valve) is not effected until the valve is properly shifted, and ere this communication is established the mouths of the channels F or G arey closed by theface of heads L or Z, as evident. By' this means the steam is exhausted from the valve-chest, and the valve will not be hindered in its movements by steampressnre in the wrong end of The valve, when shifted, estaband channel F, or groove M and channel G, before it has completed its stroke, and the steam passing through said channel and grooves exerts a momentary back-pressure betweenv the head of the valve and the end of the chest sufiicient to cushion the latter and prevent injurious and annoying knocking of the valve in the chest.

Q is a short pitmaIr-rod playing througha proper stuing-box in one end of chest B. This rod is pivotally connected to a rocking lever, R, pivoted upon an arm, S, projecting from the base of chest B, as shown. By means of these devices the valve can be thrown into working position should it accidentally jar communicatin g with the opposite ends of said cylinder and centrally with the chest, and the ingress-port C, communicating with the center of the valve-chest, and exhaust-ports O o, communicating with the ends of said chest, with the piston and the steam-actuated valve in said chest adapted to simultaneously establish communication between the port C and one port, E or D, and to establish communication between the remaining one of said I D and E, channels F and G, and piston-head H, grooved and perforated substantially as described, and the valve-chest B, its ingress and egress ports C and O 0, with the valve J, having collars K 7e, heads L Z, and intermediate reduced portions, j, P, and p, and the annular grooves and perforations in heads L l, and the rods Q, lever R, and arm S, all constructed and arranged substantially in the manner and for the purpose described.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses. I A

JOHN C. BROMLEY.

llitliesses:

WILLIAM ADAMsoN, JAMEs H. SOUTHWELL. 

